package com.wk1un2.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Random;

import org.apache.shiro.codec.Hex;

public class MD5Util {

	     /**
	      * 普通MD5加密<br>  
	      *   
	      * @param input 
	      * @return
	      */
	    public static String MD5(String input) {  
	        MessageDigest md5 = null;  
	        try {  
	            md5 = MessageDigest.getInstance("MD5");  
	        } catch (NoSuchAlgorithmException e) {  
	            return "check jdk";  
	        } catch (Exception e) {  
	            e.printStackTrace();  
	            return "";  
	        }  
	        char[] charArray = input.toCharArray();  
	        byte[] byteArray = new byte[charArray.length];  
	  
	        for (int i = 0; i < charArray.length; i++)  
	            byteArray[i] = (byte) charArray[i];  
	        byte[] md5Bytes = md5.digest(byteArray);  
	        StringBuffer hexValue = new StringBuffer();  
	        for (int i = 0; i < md5Bytes.length; i++) {  
	            int val = ((int) md5Bytes[i]) & 0xff;  
	            if (val < 16)  
	                hexValue.append("0");  
	            hexValue.append(Integer.toHexString(val));  
	        }  
	        return hexValue.toString();  
	  
	    }  
	   
	       
	       
	       
	        /**
	         * 加盐MD5加密<br>
	         * 
	         * @param password
	         * @return
	         */
	        public static String getMD5(String password) {  
	            Random r = new Random();  
	            StringBuilder sb = new StringBuilder(16);  
	            sb.append(r.nextInt(99999999)).append(r.nextInt(99999999));  
	            int len = sb.length();  
	            if (len < 16) {  
	                for (int i = 0; i < 16 - len; i++) {  
	                    sb.append("0");  
	                }  
	            }  
	            String salt = sb.toString();  
	            password = md5Hex(password + salt);  
	            char[] cs = new char[48];  
	            for (int i = 0; i < 48; i += 3) {  
	                cs[i] = password.charAt(i / 3 * 2);  
	                char c = salt.charAt(i / 3);  
	                cs[i + 1] = c;  
	                cs[i + 2] = password.charAt(i / 3 * 2 + 1);  
	            }  
	            return new String(cs);  
	        }  
	  
	        /**
	         * 校验加盐后是否和原文一致<br>
	         *   
	         * @param password
	         * @param md5
	         * @return
	         */
	        public static boolean verify(String password, String md5) {  
	        	try {
	        		char[] cs1 = new char[32];  
		            char[] cs2 = new char[16];  
		            for (int i = 0; i < 48; i += 3) {  
		                cs1[i / 3 * 2] = md5.charAt(i);  
		                cs1[i / 3 * 2 + 1] = md5.charAt(i + 2);  
		                cs2[i / 3] = md5.charAt(i + 1);  
		            }  
		            String salt = new String(cs2);  
		            return md5Hex(password + salt).equals(new String(cs1));  
				} catch (Exception e) {
					return false;
				}
	            
	        }  
	  
	        /**  
	         * 获取十六进制字符串形式的MD5摘要  
	         */  
	        private static String md5Hex(String src) {  
	            try {  
	                MessageDigest md5 = MessageDigest.getInstance("MD5");  
	                byte[] bs = md5.digest(src.getBytes());  
	                return new String(new Hex().encode(bs));  
	            } catch (Exception e) {  
	                return null;  
	            }  
	        }  
	  
	       
	       
	}
